The first chapter reminded me a lot of King of Bandits Jing's first chapter lol.

Two mermaids, one of them is captured. Heroic guy with black spiky hair comes along, beats up evil guys, saves mermaids.

As far as whether I think this will be good or not, only time will tell. The first chapter was extremely corny, black vampire with brooding dark past, super strong special powers, saves beautiful girls. Typical anime here.

What set King of Bandit's Jing apart was that Jing was a mellow guy didn't say much, and killed people by sticking his hand up a bird's ass. How many heroes do you know of that stick their hands up birds' asses? How many brooding vampires do you know of? I thought so.